I have owned a set of these speakers for a number of years. They perform best when bi-amped, I use an Arcam 7R integrated for the treble and Arcam 9 power for the mid/bass. The result is a compelling mixture of clarity and control, which easily shows the quality of recording.
They go loud and are great party speakers, in a positive way, never seaming strained or close to clipping.
They are physically large stand mounting speakers and I have mine on 12 inch stands to keep them at ear height when sitting down. They replaced as set of Celestion Ditton 15 speakers and sound to me to be the better speaker, despite the Dittons reputation. Perhaps it is the extended frequency range on the tannoys 30000 v 14000.
Would I change them, only if I could find a good set of 611 or 613 floor standers. As I believe that they have a similar sound, but have an even deeper bass.